Previously there was a portable version that could be downloaded from here but they removed it and now the download link redirects to the Listary home page.
So doing a web search I found the portable version of the latest version of Listary (6.0.5.16) Just go to this page, scroll down to “Download 6.0.5.16 Beta Portable”, click on the link that appears there, a new window opens and choose the DropAPK FileHost, on that server you can download the portable version.
I hope the file can be useful for you